I think it's great. There's no reason why guys with lowish hours can't be perfectly acceptable as airline F/O's after the correct sim and line training.
Lots of twenty year old guys and girls flying solo in F-18's in the military with only a couple hundred hours and a good dose of training.
Not a problem. It also reflects the changed nature of the role of crew in modern jets who are now more systems managers than stick and rudder pilots.
Perfectly acceptable way to get people up to speed I think. Besides, The sims are so good now that this can happen and it's all still perfectly safe.